I hear you. I lived in Michigan until 2007. People who don't live there don't understand the necessity for a locked 4H. It's for the left lane of I-75 with a white out, 6" on the ground and indicated speed of 80 mph....while pulling a trailer with 4 snowmobiles. You need the diff between the axles locked, the rear diff tight, but not locked, a firm grip on the wheel, heavy metal on the entertainment system and really bright forward illumination while you're watching to make sure you can tell when the guy in the suburban in front of you leaves the center of the lane so that you don't follow him into the ditch. People elsewhere think it's insane...Michiganders realize it's just a higher level of consciousness. Down her in NC, they won't drive that fast on a clear day when it's 70 degrees. 4A is nice for lower velocities and slippery conditions in the city.
Just saying.